In the same year 1 1 month, Guo Xu succeeded Huaidong in appeasement, and was extremely dissatisfied with Li Quan's expansion of personal power, and advocated suppressing the development of Li Quan's power, thus weakening its army. Therefore, when he first arrived, he went to meet him in the suburbs and left without seeing him. Yang knew his intention, so he brought his own military school to save his strength. In the first year of Baoqing, Li Quan sent from Qingzhou to Chuzhou, conspired with Yang to kill his staff, and forced the Song Dynasty to send another official to change its policy towards the North Army. The northern army called Li Quan "the gracious mansion" and Yang "the gracious hall".
In the third year of Jin Zhengda (1226), Li Quan was besieged by the Mongols in Qingzhou for one year. During this period, it was reported that Li Quan was dead, and Song Huaidong made Liu Cong want to seize the opportunity to destroy Yang in Chuzhou and its ministries. Order (former Liu's subordinate, one of the important generals of Beiyang Army) to be heavily stationed outside Chuzhou City. Yang stays calm in times of crisis. Invite Xia Quan into the city, treat each other with wine and meat, and turn enemies into friends. Xia Quanfan sent troops to surround Liu Cong in the state. Liu Cong entered the city in the middle of the night and fled to Yangzhou alone. After expelling Liu Cong, Yang rejected him again, so he had to leave Chuzhou and join the ranks of the rulers.
Li Quan's army in Chuzhou was saved by Yang. However, after Li Quan came to Mongolia, Qingzhou had just been cleared, and Li Fu and Liu Qingfu in Chuzhou were killing each other. After Liu Qingfu's death, Li Fu drove Yao Di out of the Song Dynasty, and Yang also helped Li Fu kill Yao Di's mistress. Therefore, the Song Dynasty no longer provided money and food for the Northern Army, which aroused the dissatisfaction of the Northern Army generals. They discussed killing Li Fook wo Yang for the Song Dynasty. So people broke into yangfu, killed a woman, Li Fook wo, the second son of Li Quan, and mistook Yang for Liu and Li Quan's wing room, as well as hundreds of family members and government soldiers. Yang took advantage of the chaos to escape and returned to Li Quan, leaving the rest of Chuzhou to be killed.